I strongly recommend *not* to install prerelease small updates. They do not contain so many new features, and as far as we all know 10.1.3 is really going to be a bug-fix release.
Even small bugs can get in the way when you're trying to get some work done.
Normally the dev-cycle of a dot-dot update is not that long, so that by the end of one or two more weeks we'll see the update in the Software Update pane.
Whole new versions of the operating system however - like 10.2 is going to be - are of course fun to play with, mostly because they contain many new features. But I also recommend installing those on a separate disk or volume...
Famous Apple System builds:
- System 7.6b3c1 (able to kill all partitions of a Mac)
- System 7.7a2c3 (erased system volume on install)
- Mac OS 8.1a1c2 (harddisk driver?)
- Mac OS X DP 4 (deep sleeping iBook never woke up again)
- Mac OS X 10.1 (5G24) (sleeping problems on TiBook)
Some funny things happened to my Macs in all the time.
Be careful, even if it's fun.